I was going through the same thing for over a year until I came across some online information. I was blessed to have found The Breath Clinic in Berkeley, CA. I was hesitant to spend $700 to go see this dentist/genius, but I'm soooooooooooooooooo glad I did. I had bad smelling bacteria on my tongue that was produced by post nasal and dry mouth (I had no idea, I suffered from either one)Please go there....I promise you'll get the answer you're looking for.